I didn't go to American high school (thanking my luck again)... but one year in German class I used my middle name when I filled out the card about who we are and what our parents did and so on, and apparently it took the teachers almost a whole trimester to figure out why the troublemaker in most other classes wasn't a problem in German class while the one who was so troublesome in German class wasn't an issue elsewhere... and one year we had a horrible History/Geography teacher who treated us like little kids (she had been an elementary school teacher and apparently didn't know that we were used to being called Monsieur and Mademoiselle (last name) with the Vous (formal) form, and instead called us Tu (informal form) and used our first names, very rude, and the one African in the class acted like he'd just come from a village and used only very African French with her, which allowed him to call HER "tu" which was a howl - she never did catch on, I don't think she ever thought to question it...